Question

A rectangular water tank is 12m long ,6m wide and 2m deep. Find the cost of repairing it's four walls and floor at the rate of Rs 15 per square meter​

Answer 1

So, area of the 4 walls=2(l+b)×h

2(12+6)×2=2×18×2

4×18=72m^2
Area of floor=12×6=72m^2
Total area=72+72=144m^2
Cost pe m^2=Rs 15

Total cost=144×15=Rs 2160:-)